Bobbin stripper



Nov. 11, 1924. I

G. J. PFEIFFER BOBBIN STRIPPER' Fi led March 22, 1922 3 Sheets-Sheet l(3. J. FFEEFFER 'BOBBIN STRIPPER Filed Mgrsh 22, 1922 3 Shams-Sheet 2nmtzzacacxm Nav. 11-, 1924.- 1,514,924

G. J. PFEIFFER BOBB IN sTRi PPER Filed March 22, 1922 3 Sheets-Sheet 5Patented Nov. 11, 1924.

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' GEORGE J. rrnifern'n, or riaovinnnon, errors-ISL ND;assioivort-roonorfr ronje KNOWLES 1300M worms, or wonons'rnn; MASSACHUSETTS, Acoeremnon or MASSACHUSETTS.

nonrr'iv' STRIPE/ER:

Application filedMarch 22,- 1922; Serial No. 545364:

I a-all whom it may concern: 7

Be 1t known thatI, GEQRGE J. PFEIFFER, a citizen of the United Statesresid ng at Providence, inthe county of Providence and operation of thewithdrawing or pullingelements of such a machine, adapting theseelements particularly for-use with bobbins having conical heads.

In the preferred form, of jaws which are regularly reciprocated and Ialso provide means for raising the jaw's above a bobbin on theinoperative stroke,

said jaws bein-g lowered-and forced against the sides of the conical.head ofthe bobbin atthe beginning ofthe operative stroke.-

My invention further relates toarrangements-and combinations of partswhich will be hereinafter desoribedand more particularly pointed out inthe appended claims.

A preferred form of my invention. is shown in the drawings, inwhich Fig.l-is aplan-viewof a'bobbin stripper embodying) my improvements; I

Figi2isa detail sectional elevation taken along the line 2 -2 in Fig. 1

Fig. anenlarged plan view of a cam shown in F i'g.- 1; e

Fig- 4; is an enlarged plan view .of the bobbin gripping jaws andtheoperatingdevices therefor;

tion, taken along the line 55 in 4;;

Fig-r 6' is a sectional end elevation taken along the"line 66lini-Fig.1; and

Figs. 7 and 8 are side elevations of the partsshownin Figs 4,illustrating the operation; of the mechanism.{

Referring particularly to Fig; 1, the bob bin stripper therein showncomprises :a frame 10 supporting apair of rotating- 1 provide a pairFig. 5 is a side elevation, partly in secshafts 11 and 12; Bobbinholdingjmembe'rs or discs13 and14y aremodnted onthe shafts 11 and 12 andthese shafts are intermittent- 1y rotated by? means of'a star wheel 15Jaiid a one-toothed-locking; pinion 16,:the latter being mounted onashaft17 having a's'pviral gear connection with a crankshaft 18co'1inected by a gear 19 'andpinion 20 to a driving'shafton whichismounted a'drivingpul' I The shaft 11 rotates in fixedbearings and.

the haft 12 is mounted in a bearingwhichis angularly: movable about apivotor stud 22 at the left-hand side of'themachine: This a shaft 12 anddisc 14 are yieldin'gly' pressedtoward theshaft 11 and disc 13 byta"lever 28 ona short shaftf24: mounted in bearingsv on the side of theframe 10.: An arm seen the shaft 24: is connected'by; allinlr26' (Fig.2) to a lever-27 mounted on a fixed' pivot 28: and actuated by a cam 30on the shaft 17:

As the high point of the cam'iengagies the" upperend Off the lever 27,the rod=26 v is moved-to the right inFig; 2 and the arin-orlever '23 iswithdrawn from the shaft 12: At other timesthe spring-onthe rod orlin'lr26 causes the lever 23 toyieldingly engage the shaft 12. a

A plunger 31- (Fig. l) is' mountedto"slide h between the shafts 11 and12 and-movesthe'u bobbin held bythe discs 13and 14 lo1igitu'- din-allyto partially eject the bobbin from between the discs. The plungerB-lis-con nected by alinlr 32to ail-arm 33mounted on, a cross 1 shaft towhich is also secured an arm 3l connected by a-linka-35 to" a crank pin36;

The parts are so timed that' 'thevshaft12 and disc 14 will be pressedinwardly at the moment when the plunger 31 is moving for:- ward topartially eject the bobbin. I

The parts thus far described are set forth" in greater detail inmy.prior application;

abovefiden'tified; and in themselves form no part of my presentinvention;

In order to secure the desiredtinied rela tion between the-cam 30andz'the'= plunger 31, Imount the cam :30 (Fig. 3 'looselyionthe shaft17 betweencollars37 and 383 The collar 37 remains iirfixed' positiononthe I shaft 17 and the collar 38' is provided' with means for removably'securing the/same to" the shaft in fixed-position when desired.

The cam 30 is provided with a toothed or zontal pivot 45 in a bracket 46(Fig. 5)

serrated flange 40 and the collar 38 is provided with a similar serratedflange 41. By slightly loosening the collar 38 and moving the same tothe left, the cam 30 may be set in any desired angular position and willbe retained therein by the co-operation of the teeth of serrations onthe flanges 40 and 41.

As shown in Fig. 3, the teeth on the flange 41 extend over a smallportion only of the circumference While the teeth on the flange 40 mayextend entirely around the flange.

The cam 30 may thus be very accurately positioned and will be securelyretained in any position. I

The plunger 31 acts to partially eject the bobbin from between the discs13 and 14 but the longitudinal withdrawal of the bobbin is completed bya pair of gripping membersor jaws 42 (Fig. 4) which are pivoted 011studs 43 in a block 44 which, in turn, is mounted to swing about ahorisecured to a slide 47. i

The slide 47 is mounted in guide-ways 48 and is connected by a link 49to the crankshaft 18 (Fig. 1). The slide and gripping members are thusregularly reciprocated in timed relation to the movements of the discs13 and 14 and the plunger 31.

,An important feature of my invention relates to the devices by whichthe gripping members 42 are controlled and directed. For this purpose Iprovide a cam roll 50 (Fig. 4) mounted on a stud 51 projecting fromoneof the gripping members 42. A cam plate 52 is provided with astud 53which is pivotally supported in bearings 54 in a bracket 55 secured toone of the guideways 48. A spring 56 is mounted on the stud 53 andengages one of the bearings 54 at one end and a collar 57 on the stud 53at the other end. The cam plate 52 is thus normally held yieldingly inits lower position and against the upper surface of the guide-way 48, asshown in Fig. 5. I

As the slide 47 moves to the left and approaches the stripping orholding discs 13 and 14, the roll 50 engages the upper surface of thecam plate 52 and raises the grip ping members as shown in Fig. 7, sothat they pass over the end of the bobbin B which has been partiallyejected from between the discs 13 and 14. At the end'of the inward orinoperative stroke, the roll 50 passes beyond the cam plate 52 and themembers 42 move to their lower operative position at the sides of thebobbin B.

Upon the return or operative movement of'the slide 47, the cam roll 50passes idly under the plate 52, swinging the same up ward about itspivot 53.

Each member 42 is also provided with a roll 60 and a cam plate 61 isprovided at the inner side of each guide-way 48. Upon their inoperativeor inward movement, the

rolls 60 are raised above the plates 61 but upon their return oroperative movements they are engaged by the plates 61., which force themembers or jaws 42 inward against the head of the bobbin B. The

gripping faces of these jaws 42 are prefermove weft from bobbins havingconical heads, as the weft clings very tightly to this type of bobbinand it has been found very diflicult to secure a firm grip on such abobbin. With my improved construction, however, the bobbin is firmlygripped between the members 42, and the final withdrawal of the bobbinfrom the stripping discs is easily accomplished. This method ofstripping a bobbin by partially removing the waste yarn therefrom,grasping that portion of the bobbin thus uncovered and applying forcethereto for the purpose of completing the stripping operation isbelieved to be broadly new and within the scope of my invention. I

Having thus described my invention and the advantages thereof, I do notWish to be limited to the details herein disclosed otherwise than as setforth in the claims, but what I claim is 1. In a bobbin stripper,stripping devices, and means to withdraw a bobbin longitudinally frombetween said devices, said means comprising a pair of bobbin grippingmembers, means to reciprocate said members, means to yieldingly separatesaid members, means to hold said members above the bobbin when moved inone direction, and means to cause said members to descend and toapproach each other and grip the bobbin when moved in the oppositedirection. I

2. In a bobbin stripper, strippingdevices, and means to withdraw abobbin longitudinally from between said devices, saidmeans comprising apair of bobbin gripping members, means to reciprocate said members,means to raise said members above the bobbin on their inoperativestroke, said mem- I bers being permitted to move downward at the end ofthe inoperative stroke, and means to force said members positivelytoward members, and means to force said members against the conical headportion of said bobbin, to grip and hold said conical head portionduring the operative movement of said members relative to said strippingdevices.

4. In a bobbin stripper, strip-ping devices, and means to withdraw abobbin longitudinally from between said devices, said members comprisinga pair of bobbin gripping members, means to reciprocate said members, acam plate to hold said members in raised position on their inoperativemove ment, and additional fixed cam plates to force said members againstthe bobbin during their operative movement;

5. In a bobbin stripper, stripping devices, and means to withdraw abobbin longitudinally from between said devices, said means comprising apair of bobbin gripping members, means to reciprocate said members, oneof said members having a roll, a pivoted cam plate engaging said roll toraise said members during their inoperative movement, a pair of fixedcam elements and a roll on each of said members engaging said camelements to force said members against the bobbin during the operativemovement of said members.

6. In a bobbin stripper, a pair of rotatable stripping jaws, shafts forsaid jaws. one of said shafts being mounted for lateral movement, andmeans to move said shaft laterally, said means including an actuatingshaft, a cam loosely mounted on said shaft, means to prevent axialmovement of said cam in one direction, and a collar fixed on said shaftat the opposite side of said cam, said collar and said cam havingco-operating serrated portions by which said cam may be held in aselected angular position on said shaft.

7. A stripper for bobbins having conical head portions comprislng meansto give a cone bobbin an initial advance movement, means engaging thewaste yarn on the bobbin and preventing movement thereof with thebobbin, devices firmly engaging the conical portion of the bobbin thusuncovered, and means to move said devices to complete the advancemovement of said. bobbin.

8. In a stripping machine for cone bobbins, stripping means, means toinitially advance a bobbin, a pair of bobbin gripping members havingconcave conical bobbin er. gaging faces, means to move said memberstoward said bobbin and to cause said members to engage the conical headportion of said bobbin uncovered by the initial advance movementthereof, and means to thereafter move said gripping members and bobbinlongitudinally to complete the stripping of the waste therefrom.

In testimony whereof I have hereunto afiixed my signature.

GEORGE J. PFEIFFER,

